Neutral density camera filter B+W 810 Master, 39 mm, Multi Resistant Coating (MRC)

B+W 810 Master is a 39 mm neutral density camera filter with Multi Resistant Coating (MRC) that reduces incoming light by ten f-stops while maintaining neutral color balance. The filter lets photographers extend exposure times and use wider apertures in bright conditions to create motion blur, smooth water surfaces, and shallow depth of field effects without introducing color shifts. Supplied as a single 39 mm screw-in filter, it is compatible with lenses that accept 39 mm filters and is made to precise optical standards.

Advantages

The ten-stop light reduction enables very long exposures that transform running water into a mist-like appearance and render moving subjects into soft, blurred shapes, allowing creative control over motion and atmosphere. Multi Resistant Coating helps minimise reflections, ghosting and surface dirt while preserving image contrast. The neutral density effect is achieved without altering color rendition, making the filter suitable for both digital and analog workflows. Its compact 39 mm screw mount keeps size and weight low for easy use on small lenses.

Suitable for

• Long exposure landscape and seascape photography to smooth water and clouds
• Urban long exposures to remove or blur moving people and vehicles
• Portraits requiring very shallow depth of field in bright light
• Creative motion blur effects such as light trails and wipe effects
• Mounting on small prime or compact zoom lenses with 39 mm filter thread

Key specifications

• Filter type: Neutral Density (ND), ND800 equivalent (10 f-stops)
• Diameter: 39 mm screw-in mount
• Coating: Multi Resistant Coating (MRC) to reduce reflections and soiling
• Optical effect: ten-stop light reduction for long exposure and wide-aperture use
• Material: high-quality optical glass (precision-ground)
• Quantity: 1 piece
• Country of manufacture: Germany

How to use

Screw the 39 mm B+W 810 Master filter onto a lens with a matching filter thread until it is secure but not overtightened. Compose and focus your scene before applying the filter when using autofocus or manual focus, as the dense filter material can make live view or optical viewfinder visibility darker. Use a stable tripod to prevent camera motion during long exposures and a remote release or self-timer to avoid shake. Meter for the scene without the filter or use an exposure calculation method for ten-stop reduction, then adjust shutter speed or aperture accordingly to achieve the intended creative effect.

Usage recommendations

For exposures of several seconds to a minute, stabilise the camera on a solid tripod and consider using mirror lock-up (if available) and a cable release or remote trigger. Check focus and composition before attaching the filter or use live view zoom for critical focus. When shooting in variable light, bracket exposures and review histograms to ensure desired highlight and shadow detail. Clean the filter with a soft lens cloth and suitable cleaner, taking care not to damage the MRC coating.